Water relations and vulnerability to embolism are not related: Experiments with eight grapevine cultivars

Drought tolerance mechanisms at the leaf level have been reported for grapevines but less is known about their vulnerability to embolism caused by water stress. The objective of this experiment was to determine if there is a relationship between xylem hydraulic characteristics and drought resistance mechanisms at the leaf level. The experiment was carried out on 10-year-old plants of 8 V. vinifera cvs: 'Sauvignon Blanc', 'Chardonnay', 'Cabernet Sauvignon', 'White Grenache', 'Black Grenache', 'Alicante Bouschet', 'Tempranillo', and 'Parellada' grown under field conditions without irrigation under Mediterranean climatic conditions. Embolism vulnerability curves were drawn for each cultivar. Values of the osmotic potential at full turgor, and at the turgor loss point, and the leaf bulk modulus of elasticity were obtained from pressure-volume curves on 4 different dates, from berries at pea size until harvest. All cultivars except 'Chardonnay', which showed elastic adjustment, showed osmoregulation but different patterns in vulnerability curves were found for each cultivar. While 'Parellada', 'Tempranillo' and 'Black Grenache' proved to have the most vulnerable xylem, 'Chardonnay' and 'Sauvignon Blanc' were shown to have the least vulnerable xylem to embolism. There was no relationship between the level of vulnerability to embolism for each cultivar and the drought tolerance mechanisms at the leaf level under the environmental conditions of this experiment. &nbsp

Challenges of viticulture adaptation to global change: tackling the issue from the roots

Viticulture is facing emerging challenges not only because of the effect of climate change on yield and composition of grapes, but also of a social demand for environmental‐friendly agricultural management. Adaptation to these challenges is essential to guarantee the sustainability of viticulture. The aim of this review is to present adaptation possibilities from the soil‐hidden, and often disregarded, part of the grapevine, the roots. The complexity of soil–root interactions makes necessary a comprehensive approach taking into account physiology, pathology and genetics, in order to outline strategies to improve viticulture adaptation to current and future threats. Rootstocks are the link between soil and scion in grafted crops, and they have played an essential role in viticulture since the introduction of phylloxera into Europe at the end of the 19th century. This review outlines current and future challenges that are threatening the sustainability of the wine sector and the relevant role that rootstocks can play to face these threats. We describe how rootstocks along with soil management can be exploited as an essential tool to deal with the effects of climate change and of emerging soil‐borne pests and pathogens. Moreover, we discuss the possibilities and limitations of diverse genetic strategies for rootstock breeding.info:eu-repo/semantics/publishedVersio

Challenges of viticulture adaptation to global change: tackling the issue from the roots

[EN] Viticulture is facing emerging challenges not only because of the effect of climate change on yield and composition of grapes, but also of a social demand for environmental-friendly agricultural management. Adaptation to these challenges is essential to guarantee the sustainability of viticulture. The aim of this review is to present adaptation possibilities from the soil-hidden, and often disregarded, part of the grapevine, the roots. The complexity of soil-root interactions makes necessary a comprehensive approach taking into account physiology, pathology and genetics, in order to outline strategies to improve viticulture adaptation to current and future threats. Rootstocks are the link between soil and scion in grafted crops, and they have played an essential role in viticulture since the introduction of phylloxera into Europe at the end of the 19th century. This review outlines current and future challenges that are threatening the sustainability of the wine sector and the relevant role that rootstocks can play to face these threats. We describe how rootstocks along with soil management can be exploited as an essential tool to deal with the effects of climate change and of emerging soil-borne pests and pathogens. Moreover, we discuss the possibilities and limitations of diverse genetic strategies for rootstock breeding.This work is framed in the networking activities of RedVitis (AGL2015-70931-REDT) and RedVitis 2.0 (AGL2017-90759-REDT), funded by the State Research Agency (AEI) of the Spanish Ministry of Science and Innovation. Ms Diana Marin is beneficiary of postgraduate scholarship funded by Universidad Publica de Navarra (FPI-UPNA-2016). Dr Juan Emilio Palomares-Rius acknowledges the State Research Agency (AEI) of the Spanish Ministry of Science and Innovation for the 'Ramon y Cajal' Fellowship RYC-2017-22228 and Dr David Gramaje acknowledges Spanish Ministry of Economy and Competitiveness for the 'Ramon y Cajal' Fellowship RYC-2017-23098.Marín, D.; Armengol Fortí, J.; Carbonell-Bejerano, P.; Escalona, J.; Gramaje Pérez, D.; Hernández-Montes, E.; Intrigliolo, DS.... (2021). Challenges of viticulture adaptation to global change: tackling the issue from the roots. Australian Journal of Grape and Wine Research. 27(1):8-25. https://doi.org/10.1111/ajgw.12463S825271AGÜERO, C. B., URATSU, S. L., GREVE, C., POWELL, A. L. T., LABAVITCH, J. M., MEREDITH, C. P., & DANDEKAR, A. M. (2005). Evaluation of tolerance to Pierce’s disease andBotrytisin transgenic plants ofVitis viniferaL. expressing the pear PGIP gene. 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Efectos de la sequía y las altas temperaturas en la respuesta ecofisiológica de la uva

Trabajo presentado al XVI Congreso Nacional de Ciencias Hortícolas organizado por la Sociedad Española de Ciencias Hortícolas (SECH) y celebrado en Córdoba del 17 al 22 de octubre de 2021.Peer reviewe

Modeling impacts of climate change on the water needs and growing cycle of crops in three Mediterranean basins

In this study, the suitability of major crops currently growing in three case study basins in Catalonia (NE Spain) was assessed for the first half of the 21st century. For this purpose, an estimation was made of net hydric needs (NHN) and a set of agroclimatic parameters. Climate change impacts were estimated at sub-basin level using temperature and precipitation temporal series based on the Third Report on Climate Change in Catalonia under the RCP4.5 scenario. Potential crop evapotranspiration (ETc, FAO procedure) and monthly water balance considering soil water holding capacity were used to estimate actual evapotranspiration (ETa) and NHN. Over the period studied, NHN would generally rise, with small (+ 0.1%) to high (+ 6.6%) increases in the 2020 s and moderate (+ 3.9%) to high (+ 6.7%) increases in the 2040 s. Dynamics would be different for the three basins and general trends vary from crop to crop. At all events, a generalized increase in NHN together with lower water availability could severely limit crop productivity in the case of both rainfed and irrigated crops (irrigation restrictions). Phenological changes could represent a greater constraint for crop productivity. Overall, the number of frost days will decrease (from −0.1 days in March to −8.7 days in April) in the three basins, while extremely hot days will increase (from + 0.3 days in July to + 3.8 days in August). Growth cycles will begin earlier (from −1 days to −12 days for crops with a base temperature of 10 °C), and for some crops they will be shorter (from −8 days to −27 days in the case of maize and up to −10 days in the case of vines). The impacts of climate change in the three basins could result in significant limitations for crops if adaptive strategies beyond irrigation and growing cycle issues are not applied. The results of this study could serve as a basis for the development of adaptation strategies to improve and maintain agriculture in the case study basins and in similar regions.info:eu-repo/semantics/acceptedVersio